We experienced a case of Henoch-Sch$ddot{o}$nlein purpura associated with Mycoplasma pneumoniae pneumonia in a 28 month old male who suffered from cough, abdominal pain and both leg swelling and pain. Physical examination showed varying sized purpura, characteristic of Henoch-Sch$ddot{o}$nlein purpura, below both knee. Laboratory test revealed Mycoplasma pneumoniae antibody titer >1:2,560 and cold agglutinins titer 1:64. Chest X-ray showed peribronchial blurring in both lung fields. The patient was treated with midecamycin and prednisolone for 7 days and responded to the treatment well. The authors report a case of Henoch-Sch$ddot{o}$nlein purpura with Mycoplasma pneumoniae pneumonia with brief review of related literatures.